From e03d2b3ffe288043f176be3beee8a00480d672a0 Mon Sep 17 00:00:00 2001
From: vraatikka <vilho.raatikka@skysql.com>
Date: Fri, 27 Sep 2013 14:57:53 +0300
Subject: [PATCH] In gw_read_client_event, if ioctl returns non-zero and 'b'
 (number of readable bytes) is zero, that indicates that socket is closed.
 Thus, read is now skipped and dcb closed if it is in DSC_STATE_POLLING state.

---
 server/modules/protocol/mysql_client.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/server/modules/protocol/mysql_client.c b/server/modules/protocol/mysql_client.c
index 02974aee2..2764737a1 100644
--- a/server/modules/protocol/mysql_client.c
+++ b/server/modules/protocol/mysql_client.c
@@ -536,9 +536,26 @@ int gw_read_client_event(DCB* dcb) {
                         dcb->state);
                 rc = 1;
                 goto return_rc;
-	} else {
-                //fprintf(stderr, "Client IOCTL FIONREAD bytes to read = %i\n", b);
 	}
+
+        /**
+         * Socket was closed.
+         */
+        if (b == 0) {
+                skygw_log_write(
+                        LOGFILE_TRACE,
+                        "%lu [gw_read_client_event] Dcb %p fd %d was closed. "
+                        "Closing dcb.",
+                        pthread_self(),
+                        dcb,
+                        dcb->fd);
+
+                if (dcb->state == DCB_STATE_POLLING) {
+                    dcb->func.close(dcb);
+                }
+                rc = 0;
+                goto return_rc;
+        }
         
 	switch (protocol->state) {
         case MYSQL_AUTH_SENT: